PDCP Layer Flow-Based QoS Management in 5G IoT Systems
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Solution Overview
Problem
Current LTE systems lack the capability for fine-tuned Quality of Service (QoS) adjustments, managing multiple flows with the same QoS, which limits the network's ability to provide differentiated service quality for various traffic types.
Innovation Solution
Introducing a new layer above the Packet Data Convergence Protocol (PDCP) layer to support flow-based QoS, allowing for more granular QoS configurations and efficient processing, along with adaptive channel state information reference signal (CSI-RS) management through MAC control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a bearer-based QoS configuration method is used as in LTE systems, then network management is simplified by grouping flows with the same QoS, but the ability to perform fine-tuned QoS adjustments for individual flows is lost
Solution Approach 1:
The patent segments the QoS management function by introducing a new layer above the PDCP layer that can independently handle flow-based QoS configurations. This segmentation allows the system to maintain the simplified bearer-based management at lower layers while adding granular flow-level control at the new upper layer, thereby resolving the contradiction between management simplicity and QoS flexibility.
Solution Approach 2:
The patent adds a new dimensional layer to the protocol stack above PDCP that introduces flow-based QoS management capabilities. This dimensional addition enables the system to operate at two levels simultaneously: bearer-based grouping for overall management and flow-based segmentation for fine-tuned adjustments, thus resolving the contradiction between simplicity and adaptability.
2Adaptability or versatility
If flow-based QoS configuration is implemented without a new layer, then per-flow QoS control is achieved, but the system lacks efficient processing mechanisms for the new QoS granularity
Solution Approach 1:
The patent establishes preliminary action by defining specific processing mechanisms at the new layer above PDCP that are designed from the outset to handle flow-based QoS efficiently. The layer includes pre-configured functions for flow identification, QoS parameter management, and packet handling that are optimized for granular control, ensuring that per-flow QoS control does not compromise processing efficiency.
3Measurement precision
If CSI-RS is continuously transmitted for channel state information, then accurate channel estimation is maintained, but network resources are wasted when channel conditions are stable
Solution Approach 1:
The patent applies dynamics by enabling adaptive CSI-RS transmission where the transmission behavior changes based on channel conditions and traffic requirements. The system can dynamically adjust between continuous transmission for accurate estimation and discontinuous transmission for resource conservation, allowing the network to optimize the trade-off between measurement precision and energy consumption based on real-time conditions.
Solution Approach 2:
The patent implements self-service through mechanisms where the system automatically adjusts CSI-RS transmission based on monitored channel conditions without requiring constant external control. The network can autonomously determine when continuous transmission is necessary and when resource-saving discontinuous transmission is sufficient, enabling the system to serve its own channel estimation needs efficiently.
Data Source
AI summary
A method for configuring a flow-based quality of service (QoS), configuring a bearer-based QoS, and introducing a new layer above a packet data convergence protocol (PDCP) layer in order to process the flow-based QoS are provided. An operation of the PDCP layer to support the new layer is also provided. The disclosure relates to a communication method and system for converging a fifth generation (5G) communication system for supporting higher data rates beyond a fourth generation (4G) system with an Internet of things (IoT) technology. The disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car or connected car, health care, digital education, smart retail, security and safety services.